Two-dimensional granular gas of inelastic spheres with multiplicative driving

We study a two-dimensional granular gas of inelastic spheres subject to multiplicative driving proportional to a power \ v(x)\(delta) of the local particle velocity nu(x). The steady state properties of the model are examined for different values of delta, and compared with the homogeneous case delta = 0. A driving linearly proportional to nu(x) seems to reproduce some experimental observations which could not be reproduced by a homogeneous driving. Furthermore, we obtain that the system can be homogenized even for strong dissipation, if a driving inversely proportional to the velocity is used.